Allow TraceMap to be created with TraceMap instance

jridgewell · Apr 20, 2022 · 174adb6 · 174adb6
1 parent 8db5df0
commit 174adb6
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/src/trace-mapping.ts b/src/trace-mapping.ts
@@ -159,7 +159,10 @@ export class TraceMap implements SourceMap {
 
   constructor(map: SourceMapInput, mapUrl?: string | null) {
     const isString = typeof map === 'string';
-    const parsed = isString ? (JSON.parse(map) as Exclude<SourceMapInput, string>) : map;
+
+    if (!isString && map.constructor === TraceMap) return map;
+
+    const parsed = (isString ? JSON.parse(map) : map) as Exclude<SourceMapInput, string | TraceMap>;
 
     const { version, file, names, sourceRoot, sources, sourcesContent } = parsed;
     this.version = version;

diff --git a/src/types.ts b/src/types.ts
@@ -1,4 +1,5 @@
 import type { SourceMapSegment } from './sourcemap-segment';
+import type { TraceMap } from './trace-mapping';
 
 export interface SourceMapV3 {
   file?: string | null;
@@ -54,7 +55,7 @@ export type InvalidGeneratedMapping = {
   column: null;
 };
 
-export type SourceMapInput = string | EncodedSourceMap | DecodedSourceMap;
+export type SourceMapInput = string | EncodedSourceMap | DecodedSourceMap | TraceMap;
 export type SectionedSourceMapInput = SourceMapInput | SectionedSourceMap;
 
 export type Needle = { line: number; column: number; bias?: 1 | -1 };